GLAS/ICESat 1 km Laser Altimetry Digital Elevation Model of Greenland
Entry ID: NSIDC-0305

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Summary
Abstract: The Geoscience Laser Altimeter System (GLAS) instrument on the Ice, Cloud, and land Elevation Satellite (ICESat) provides global measurements of elevation, and repeats measurements along nearly-identical tracks; its primary mission is to measure changes in ice volume (mass balance) over time. This digital elevation model (DEM) of Greenland is derived from GLAS/ICESat laser altimetry profile data and provides new surface elevation grids of the ice sheets and coastal areas, with greater latitudinal extent and fewer slope-related effects than radar altimetry. This DEM is generated from the first seven operational periods (from February 2003 through June 2005) of the GLAS instrument. It is provided on polar stereographic grids at 1 km grid spacing. The grid covers all of Greenland south of 83° N. Elevations are reported as centimeters above the datums, relative to both the WGS 84 ellipsoid and the EGM96 geoid, in two separate elevation data files. A data quality map of the interpolation distance is distributed in addition to the elevation data. ENVI header files are also provided. The data are in 4-byte (long) signed integer binary files (big endian byte order) and are available via FTP.

Related URL
Link: VIEW PROJECT HOME PAGE
Description: ICESat/GLAS Data at NSIDC


Link: VIEW RELATED INFORMATION
Description: GLAS/ICESat 500 m Laser Altimetry Digital Elevation Model of Antarctica


Link: VIEW RELATED INFORMATION
Description: Polar Ice Sheet DEMs and Elevation Data


Geographic Coverage
 N: 83.0 S: 60.0  E: -11.0  W: -73.0

Data Set Citation
Dataset Originator/Creator: John P. DiMarzio
Dataset Title: GLAS/ICESat 1 km Laser Altimetry Digital Elevation Model of Greenland
Dataset Release Date: 2007-06-21
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: NSIDC: National Snow and Ice Data Center
Online Resource: http://nsidc.org/data/NSIDC-0305


Temporal Coverage
Start Date: 2003-02-01
Stop Date: 2005-06-30


Location Keywords
CONTINENT > NORTH AMERICA > GREENLAND


Data Resolution
Latitude Resolution: 1 km
Longitude Resolution: 1 km


Science Keywords
CRYOSPHERE >GLACIERS/ICE SHEETS >GLACIER ELEVATION/ICE SHEET ELEVATION    [Definition]
TERRESTRIAL HYDROSPHERE >GLACIERS/ICE SHEETS >GLACIER ELEVATION/ICE SHEET ELEVATION    [Definition]


ISO Topic Category
ELEVATION


Platform
ICESAT >Ice, Cloud and Land Elevation Satellite    [Information]


Instrument
GLAS >Geoscience Laser Altimeter System    [Information]


Project
ICESAT >Ice, Cloud and Land Elevation Satellite    [Information]
ESIP >Earth Science Information Partners Program    [Information]
EOSDIS >Earth Observing System Data Information System    [Information]


Quality
Slope and elevation accuracy of the DEMs is best near the latitudinal limit of satellite coverage (±86°), and provides a good representation of the ice sheet and mountain areas (based on comparison with satellite images). DEM accuracy decreases as track spacing between ICESat profiles increases equatorward. As a quality and accuracy indicator, the mean distance of all contributing GLAS surface spot data to the grid cell center was recorded in a separate identical grid for each ice sheet. These mean distance files are provided with the elevation data.


Keywords
Altimetry
Dem
Digital Elevation Model
Elevation
Greenland
Ice Sheet
Ice Sheet Elevation
Polar
Polar Stereographic


Data Set Progress
COMPLETE


Data Center
NSIDC Distributed Active Archive Center    [Information]
Data Center URL: http://nsidc.org/daac/index.html

Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org

Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA



Distribution
Distribution_Media: FTP
Distribution_Size: 24 MB
Distribution_Format: Binary


Personnel
JOHN DIMARZIO
Role: INVESTIGATOR
Phone: 301-614-5893
Email: john.dimarzio at gsfc.nasa.gov
Contact Address:
SGT, Inc.
NASA/Goddard Space Flight Center
Cryospheric Sciences Branch Code 614.1
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


ANITA BRENNER
Role: INVESTIGATOR
Email: anita.brenner at gsfc.nasa.gov
Contact Address:
Laboratory for Hydrospheric Processes
NASA/Goddard Space Flight Center
Code 614.5
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


HELEN AMANDA FRICKER
Role: INVESTIGATOR
Email: hafricker at ucsd.edu
Contact Address:
Scripps Institution of Oceanography
Institute of Geophysics and Planetary Physics
University of California, San Diego
9500 Gilman Dr.
City: La Jolla
Province or State: CA
Postal Code: 92093-0225
Country: USA


BOB E. SCHUTZ
Role: INVESTIGATOR
Phone: 512-471-1356
Fax: 512-471-3570
Email: schutz at utcsr.ae.utexas.edu
Contact Address:
GLAS Science Team Lead
University of Texas at Austin
Center for Space Research
City: Austin
Province or State: TX
Postal Code: 78712-1085
Country: USA


CHRISTOPHER A. SHUMAN
Role: INVESTIGATOR
Phone: 301-614-5706
Fax: 301-614-5644
Email: Christopher.A.Shuman at nasa.gov
Contact Address:
Cryospheric Sciences Branch
Code 614.1
NASA/Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


H. JAY ZWALLY
Role: INVESTIGATOR
Phone: 301-614-5643
Fax: 301-614-5644
Email: Jay.Zwally at nasa.gov
Contact Address:
Laboratory for Hydrospheric Processes
NASA/Goddard Space Flight Center
Code 614
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


NSIDC USER SERVICES
Role: TECHNICAL CONTACT
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


Publications/References
Abshire, J., and 8 others. 2005. Geoscience Laser Altimeter System (GLAS) on the ICESat mission: on-orbit measurement performance. Geophysical Research Letters v. 32, L21S02, doi:10.1029/2005GL1024028. Brenner, A., and 11 others. 2003. Derivation of range and range distributions from laser pulse waveform analysis for surface elevations, roughness, slope, and vegetations heights, Algorithm Theoretical Basis Document (ATBD) v.4.1, available at http://www.csr.utexas.edu/glas/atbd.html. DiMarzio, J. P., A. C. Brenner, and H. J. Zwally. 2004. Comparison of Envisat and ERS radar altimetry for ice –sheet elevation change studies. ESA Envisat Sympsium, Salzburg, Austria, September 9, 2004. Krabill, W., W. Abdalati, and 7 others. 2002. Aircraft laser altimetry measurement of elevation changes of the Greenland Ice Sheet: technique and accuracy assessment. J. Geodynamics 34, 357-376. Shuman, C., J. Zwally, B. Schutz, A. Brenner, J. DiMarzio, V. Schuedo, and H. Fricker. 2006. ICESat Antarctic elevation data: preliminary precision and accuracy assessment. Geophysical Research Letters 33, L07501, doi:10.1029/2005GL025227. Zwally, H. J., A. C. Brenner, J. A. Major, T. V. Martin, and R. A. Bindschadler. 1990. Satellite radar altimetry over ice, Vol. 1. Processing and corrections of Seasat data over Greenland. NASA Reference Publication 1233.

Creation and Review Dates
DIF Creation Date: 2007-06-21
Last DIF Revision Date: 2014-05-19

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